Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6b3c263c61c622…

MALICIOUS

PDF

106.9 KB Created: 2020-11-21 21:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3767bd3814d5de992e652065132d1e5e SHA-1: 721130dbb122fb7c83bdfb0c991ce50c354f8067 SHA-256: 7f6b3c263c61c6222ac74fccf4db427a2d07030317e81f5a1045a33a7f9974db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/123?utm_term=the+fundamental+theorem+of+algebra+states PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5fa2040819514.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/rumurikokar-zejebow-pomudopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421782/normal_5f97527996ebd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_5fb03397a7be8.pdfIn PDF document text
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/1d4966bb5812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424933/normal_5fab610b5eb76.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fosawef/36273481015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e92b3b-efce-464c-9a9c-7a3e04de4512/35258754754.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/wetunawexezekagosikin.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/enzymatic_and_non_enzymatic_antioxidants.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/keladena.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/sozugezer.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5D 5412 bytes
SHA-256: 84cf911bb099bb4e78eaf4f8fc5488f9a5d4f6869482922d5914e7adf8d972e9
font_01_sfnt_off00014c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8D 2172 bytes
SHA-256: 6d9044e88a600f55c2b8799f62b522751254ce0b91e35f70fc2ebfe1dc71f479
font_02_sfnt_off000155ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155EE 15764 bytes
SHA-256: 77e33098b5d5f508197ad7ed9037845f5d1d883d7d1c18123b38072fcdeba150
font_03_sfnt_off00018765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18765 16432 bytes
SHA-256: ed65e9e3527520556ccb0fe4b3652f74ca86fc869886dbf591b7483567427d2e

Open this report in the interactive analyzer, or submit your own file for analysis.